Portable battery charger



FIG. 1 is a perspective view of a portable battery charger showing ournew design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The ornamental design for a portable battery charger, as shown anddescribed.